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Letters Patent No. 76,677, dated April 14, 1868.

IMPROVEMENT IN SAW-MILLS,

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TO ALL -WHOM I'l MAY CONCERN:

i Beit known that I, LONDS B. WALKER, of Chicago, in the county of Cook, and State of Illinois, hav e invented a. new and useful Improvement in Resawing Machines; and I do hereby declare and make known that the following is a full, clear, and exact descriptionV of the same, reference being had. to the accompanying drawings and the letters and figures marked thereon, which form part of this specification.

` My said invention relates to that class of sawing-machines which are designed to saw siding or clapboards, or other thin stuit', from lumber which has previously been sawed in ordinary saw-mills, into pieces of proper size; and it consists in so pivoting orattaching the frame which contains the feed-bed and rollers to the perl-11anent frame of the machine supporting the saw, that the lumber being sawed may be fed to the saw in such a.

-position with reference to the saw as that the edges ofthe siding maybe of di'erent thicknesses, the saw passing through the pieces being resawcd diagonally, as hereinafter more fully set forth.

To enable those skilled in the art to understand how to construct and usemvinvention. I will proceed to describe the same with particularity, making reference in so doingr to the aforesaid drawings, in which-- Figure 1 represents a frontelevati'on of my invention, and

Figure 2 is a plan or top-view of the same. Y

Similar letters of reference in the different figures denote the same part of my said invention.

A represents any suitable frame, of iron or wood, supporting a horizontal shaft, upon which a. circular saw, S, is xed, and which is provided with a drum, X, whereby the power is applied to' operate the saw, and also with a second drum, R, by means of which a belt, passing around a drum, N, upon a shaft, I, revolves the shaft H, and operates the feed, as hereinafter specified, said shaft H being revolved by means o'f the frictional gear-wheels P Q, the former being upon the sha-ft I, and the latter upon the shaft H, as shown in iig. 1.

B represents a vertical irbn frame, arranged at the front of thc mai-n frame A, being pivoted theretolat b, in the centre or line of the saw S, so as to be susceptible of an independent oscillating.;` movement uponl its pivoted support at l. Y

A horizontal feed-table, T, projects from the said adjustable frame B, as seen in iig. 2, upon which the material to be resawed rests, as it is being fed to the saw by the action of the rollers E, as hereinafter described.

Upon the top of the said-frame B are secured, in such a manner as to have a lateral lsliding motion towards and from each other, two slides, marked C C, upon which are suitable supports or bearings for the journals of the aforesaid feed-rollers E, so that the said sliding movements of the slides C C will increase or diminish the space between each pair in front ofthe edge of the saw.

The upper ends of said rollers are provided with spur-wheels F, engaging with the gear-wheelD l), upon the vertical shafts d d, which'hav'e their bearings'in the slides C C, and in certain frames J, thereunto attached, as shown in the drawings in iig. 1. f The said shafts d d are provided with bevel-gear wheels F, engaging with corresponding wheels G upon the-aforesaid shaft H, so that the revolution of said shaft II, as aforesaid, will revolve the feed-rollers E, said bevl-wheels-G being provided with a feather, entering a longitudinal groove in the shaft, so as to revolve` with the shaft, and still move longitudinally upon saidl shaft, by the action of the arms K K projecting down from the slides C C, as shown inr fig. 1, so as te'keepA the wheels GF always in gear in all positions ofthe slides with respect to each other. l

The ,pressure between the aforesaid friction-wheels P Q is regulated by moving the Weight O upon the leve'r M, which is pivoted at m, and has its short arm attached to a movable box, z', through which the shaft I passes, as shown. l

To one of said slides C, a rod, r, is secured, and te the other slide C is attached a similar rod, t, and s s rep.n resent nuts, arranged upon said rods, whieh have screw-threads cut thereon. u

To these nuts is attached, in any suitable manner, a bent lever, L, as'shown, upon the end of which a Weight, W, is suspended; and the tendency of this arrangement is to force the two pairs of rollers E towards each other, and thus produce the pressure upon the lumbert'o be reserved requisite to insure the same being passed or fed through the machine by the revolution of the said rollers E, as before described, ivhile, by raising up said lever, the pressure is removed, and the spucebetween the said rollers isienlarged to admit of pieces of different thickness being operated upon.

By revolving said rods r t, by meuns of a. key or otherwise, the relative positions of the nuts s s muy be changed, so as to regulate the application ofthe pressure, asdesired, which pressure may also be increased or diminished by varying the position of the weight W upon the lever.

It will bc observed that all the shafts, gearing, and machinery, excepting the shaft of the saw, have their support upon and in the adjustable frame B, so that the turning or moving seid freine does not disturb in the least the relation cr operatiomthereof. v

Y represents a rod passing through a stationery lug, x, upon the stationnry'frume A, so as to revolve freely, but to have no sliding movement in the same. This rod is formed es a screw upon the exterior, as shown, and passes through a. nut at y, on the frame B, so that by turning said rod by'means ofa winch or otherwise, the pivoted frame B is swung out of the vertical position to one side, sotha-t the faces of the rollers E are not parallel with the'saw S; and when the desired ongle is attained, the frame B may be securely fixed' in position by tightening the sot-screws V, which pass through slots in the pivoted frame, as shown-in iig. 1.

The said frame B may be moved or adjusted, for the purposes described, by any other suitable device. Havmg described the nature, construction, and operation of my invention, I will now specify what I claim,

and desire to secure by Letters Patent.

1. I claim the frame B, pivotedes described, andconstructed to sustain the feed-rollers and their drivingwheels, with slots and bolts, or their equivalents, to admit of the vibration of the frame, substantially in' the manner and for the purposes`specied. Y

2. I claim the slides C C, which carry the feed-rollers and gear-wheels, in combination with the lever L, rods r and t, connecting-link und adjusting-nuts, all arranged and operating in the manner and for the purposes set forth and described. Y l

'LONDUS B, WALKER.

Witnesses:

W. E. MAnns, L. L. Comms. 

